damir wrote:We will most probably be coming with public transportation
Try to arrive in Merced, California. There's a daily bus that goes from Merced to Yosemite Valley. See YARTS at
http://www.yarts.org/ Or you can rent a car--it's much easier. The closest major airport is Fresno Yosemite Airport, Fresno, California ("FAT")
If you have time, you should also visit the Giant Sequoias in Wawona Grove at the southern part of Yosemite National Park. There's a tour bus that leaves from Yosemite Valley hotels and back in the same time.
damir wrote:and plan to sleep in a tent, hopefully in a campground with basic facilities and low bear traffic.
No such thing as a campground with low bear traffic. Keep your food in your car or in bear lockers in the campground.
The Black Bear in Yosemite is not as dangerous as other bears, such as the Grizzley Bear or Polar Bear. They generally do not attack people, if they have no food. They want your food, not you. They are more dangerous if you approach them, get between a mother bear and her cubs.
I strongly recommend reserving a campground in Yosemite Valley, preferably the first day they become available. The Pines Campgrounds are in Yosemite Valley. Any of them are OK. To see how many campsites are available on a given day see:
http://www.yosemitesites.com/Reservations for summer will open up in the next month or so.
To reserve a campsite, go to this US government website:
http://www.recreation.gov/damir wrote:[is it] entirely possible to find place for a small tent even in the summer without reservations?
Unlikely. Your best bet is in the middle of the week in the morning when people are leaving.